Simulation of Reinforced Concrete Member Response Using Lattice Model

Lattice models are well suited for crack simulations; however, their use has been mostly limited to the fracture of plain concrete. In this study, a practical two-dimensional mesoscale lattice composed of overlapping elements was employed to simulate the monotonic response of reinforced concrete elements. The force-deformation response of each element is calibrated from direct tension tests. An explicit time integration technique with novel proportional-integral-derivative control is used to efficiently simulate the response under monotonic loading. Six different reinforced concrete member simulations were conducted to validate the proposed approach. It was found that the proposed approach was capable of reproducing the load-deformation characteristics of elements failing in shear or flexure with a reasonable accuracy. A deterministic sensitivity analysis was conducted to uncover the response parameters with the most influence on the response estimations. Concrete tensile strength and steel yield strength were found to be the most influential parameters affecting strength and energy absorption capacities. Interestingly, the variation in fracture energy and tensile-softening parameters appeared to exhibit insignificant differences for strength and energy absorption estimations in the reinforced concrete simulations.


Simulation of dynamical refractive index change in on-chip optical devices
Aslan, Anıl; Kocaman, Serdar; Department of Electrical and Electronics Engineering (2019)
Theoretical modeling and numerical verification are essential in integrated photonics for designing optimized structures as well as interpretation of the experimental results. In this thesis, a dynamically changing refractive index modification for the Finite Difference Time Domain (FDTD) method is proposed, implemented with C++ and results are compared with recent experimental studies. The proposed method is based on the idea of the time-domain simulation of the non-stationary objects while satisfying the ...
Application of Continuum Damage Mechanics in discontinuous crack formation: Forward extrusion chevron
Soyarslan, Celal; TEKKAYA, AHMET ERMAN; Akyüz, Uğurhan (2008-06-01)
Materializing Continuum Damage Mechanics (CDM), numerical modeling of discrete internal cracks, namely central bursts, in direct forward extrusion process is presented. Accordingly, in a thermodynamically consistent setting, a local Lemaitre variant damage model with quasi-unilateral evolution is coupled with hyperelastic-plasticity. The formulations are constructed in the principal axes where simultaneous local integration schemes are efficiently developed. To this end, the framework is implemented as ABAQ...
Optimum design of reinforced concrete plane frames using harmony search algorithm
Akın, Alper; Saka, Mehmet Polat; Department of Engineering Sciences (2010)
In this thesis, the optimum design algorithm is presented for reinforced concrete special moment frames. The objective function is considered as the total cost of reinforced concrete frame which includes the cost of concrete, formwork and reinforcing steel bars. The cost of any component is inclusive of material, fabrication and labor. The design variables in beams are selected as the width and the depth of beams in each span, the diameter and the number of longitudinal reinforcement bars along the span and...
Sezer, Ali Devin; Özbudak, Ferruh (2011-06-01)
Mixed-level orthogonal arrays are basic structures in experimental design. We develop three algorithms that compute Rao- and Gilbert-Varshamov-type bounds for mixed-level orthogonal arrays. The computational complexity of the terms involved in the original combinatorial representations of these bounds can grow fast as the parameters of the arrays increase and this justifies the construction of these algorithms. The first is a recursive algorithm that computes the bounds exactly, the second is based on an as...
Seismic upgrading of reinforced concrete frames with structural steel elements
Özçelik, Ramazan; Binici, Barış; Department of Civil Engineering (2011)
This thesis examines the seismic internal retrofitting of existing deficient reinforced concrete (RC) structures by using structural steel members. Both experimental and numerical studies were performed. The strengthening methods utilized with the scope of this work are chevron braces, internal steel frames (ISFs), X-braces and column with shear plate. For this purpose, thirteen strengthened and two as built reference one bay one story portal frame specimens having 1/3 scales were tested under constant grav...
Citation Formats
B. B. Aydın, K. Tuncay, and B. Binici, “Simulation of Reinforced Concrete Member Response Using Lattice Model,” JOURNAL OF STRUCTURAL ENGINEERING, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: